Physiology of Muscles

Question 1

Orbicularis Oris

Answer 1

Protrudes the lips and compresses them against the teeth, while shaping them during speech

Question 2

Levator labii superioris

Answer 2

Raises the upper lip and is innervated by the facial nerve

Question 3

Depressor labii inferioris

Answer 3

Depresses/lowers the lower lip

Question 4

Buccinator

Answer 4

Compresses the cheeks, like when playing a trumpet or blowing air. During chewing it moves food back across the teeth inside the cheeks

Question 5

Mentalis

Answer 5

When one pouts, the skin of the chin is elevated and the lower lip is protruded.

Question 6

Orbicularis oculi

Answer 6

Allows one to close the eyelid and to blink, squint, and preform other movements to protect the eye

Question 7

Levator palpebrae superioris

Answer 7

operates when one raises the upper eyelid

Question 8

Nasalis

Answer 8

Elevates the corners of the nostrils

Question 9

Masseter

Answer 9

Elevates the mandible

Question 10

Sternocleidomastorid

Answer 10

Flexes and bends the neck toward the shoulder

Question 11

Temporalis

Answer 11

Important muscle in mastication or chewing as it elevates the mandible when the lower jaw moves

Question 12

Scalene Muscles

Answer 12

Aid in breathing

Question 13

Trapezius

Answer 13

Elevates the clavicle and scapula to extend the head

Question 14

Rectus Abdominus

Answer 14

Depresses the ribs and permits flexion at the waistline

Question 15

Transversus abdominis

Answer 15

Compresses the abdominal wall

Question 16

Pectoralis major

Answer 16

Flexes the arm and adducts it

Question 17

Deltoid

Answer 17

Prime abductor of the arm

Question 18

Pectoralis minor

Answer 18

Thin muscle close to the pectoralis major

Question 19

External intercostals

Answer 19

Elevates the ribs during inspiration

Question 20

Internal intercostals

Answer 20

Decreases the size of the thorax during forced expiration

Question 21

Subscapularis

Answer 21

Rotates the arm in the medial direction

Question 22

Teres major

Answer 22

Extends the arm

Question 23

Biceps brachii

Answer 23

A main flexor of the forearm

Question 24

Pectineus

Answer 24

Flat muscle that adducts and flexes the thigh

Question 25

Sartorius

Answer 25

One of the body’s longest muscles

Question 26

Rectus Femoris

Answer 26

A superficial thigh muscle that extens the knee and flexes the thigh at the hip joint

Question 27

Latissimus dorsi

Answer 27

Acts antagonistically to the pectoralis major. It extends the arm

Question 28

Flexor carpi radialis

Answer 28

Flexes the wrist and abducts the palm of the hand

Question 29

Flexor carpi ulnaris

Answer 29

This muscle flexes and adducts the wrist

Question 30

Brachioradialis

Answer 30

Its primary function is to flex the forearm

Question 31

Supinator

Answer 31

Supinates the arm

Question 32

Pronator teres

Answer 32

Antagonistic to the supinator

Question 33

Semitendinosus

Answer 33

This muscle flexes the knee and can also extend the thigh at the hip

Question 34

Gluteus Maximus

Answer 34

Largest and most posterior of the muscles

Question 35

Gastrocnemius

Answer 35

This muscle adducts the foot and flexes the leg